Check your blood sugar level before bed. Alcohol can lower blood sugar levels long after you've had your last drink. So check your blood sugar level before you go to sleep. If your blood sugar isn't between 100 mg/dL and 140 mg/dL (5.6 mm/L and 7.8 mmol/L), have a snack before bed. The snack can counter a drop in your blood sugar. More @Wikipedia
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